package com.yuan.app.pms.service.impl;

import com.yuan.app.pms.service.CategoryBrandRelationService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.yuan.common.utils.PageUtils;
import com.yuan.common.utils.Query;

import com.yuan.app.pms.dao.CategoryDao;
import com.yuan.app.pms.entity.CategoryEntity;
import com.yuan.app.pms.service.CategoryService;
import org.springframework.util.StringUtils;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {
    @Autowired
    private CategoryBrandRelationService categoryBrandRelationService;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }


    /**
     * 查出所有分类以及子分类，以树形结构组装起来
     */
    @Override
    public List<CategoryEntity> listWithTree() {
        //1.查出所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);

        //组装父子树形结构
        List<CategoryEntity> list = entities.stream().filter(e -> e.getParentCid() == 0)
                .map((menu) -> {
                    menu.setChildren(getChildrens(menu, entities));
                    return menu;
                }).sorted((menu1, menu2) -> {
                    return (menu1.getSort() == null ? 0 : menu1.getSort()) - (menu2.getSort() == null ? 0 : menu2.getSort());
                }).collect(Collectors.toList());


        return list;
    }

    /**
     * 删除
     *
     * @RequestBody:获取请求体，必须发送POST请求 SpringMVC自动将请求体的数据（json），转为对应的对象
     */
    @Override
    public void removeMenuByIds(List<Long> asList) {
        //TODO  1、检查当前删除的菜单，是否被别的地方引用

        //逻辑删除
        baseMapper.deleteBatchIds(asList);
    }

    @Override
    public Long[] findCatelogPath(Long catelogId) {

        List<Long> paths = new ArrayList<>();
        List<Long> list = seek(catelogId, paths);

        Collections.reverse(list);

        return (Long[]) list.toArray(new Long[list.size()]);
    }

    @Override
    public void updateDetail(CategoryEntity category) {
        this.updateById(category);

        if (!StringUtils.isEmpty(category.getName())) {
            categoryBrandRelationService.updateReletion(category.getCatId(), category.getName());
        }

    }

    private List<Long> seek(Long id, List<Long> paths) {
        paths.add(id);
        CategoryEntity categoryEntity = this.getById(id);
        if (categoryEntity.getParentCid() != 0) {
            seek(categoryEntity.getParentCid(), paths);
        }
        return paths;
    }

    private List<CategoryEntity> getChildrens(CategoryEntity root, List<CategoryEntity> all) {


        List<CategoryEntity> collect = all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid() == root.getCatId();
        }).map(
                categoryEntity -> {
                    categoryEntity.setChildren(getChildrens(categoryEntity, all));
                    return categoryEntity;
                }
        ).sorted((menu1, menu2) -> {
            //2、菜单的排序
            return (menu1.getSort() == null ? 0 : menu1.getSort()) - (menu2.getSort() == null ? 0 : menu2.getSort());
        }).collect(Collectors.toList());


        return collect;
    }

}









